Cw3
a) (x+2y)^2=(x+2y)(x+2y)=x^2+4xy+4y^2
b) (2x-y)^2= (2x-y)(2x-y)=4x^2-4xy+y^2
c) (3x+2y)^2=
=(3x+2y)(3x+2y)=9x^2+12xy+4y^2
d) (3x+1/2y)^2= (3x+1/2y)(3x+1/2y)=9x^2+3xy+1/4y^2
e)(2x-1/4y)^2= (2x-1/4y)(2x-1/4y)=
=4x^2-xy+1/16y^2
f)(1/2x+1/3y)^2= (1/2x+1/3y)(1/2x+1/3y)=
=1/4x^2+1/3xy+1/9y^2
Cw4
a)(√7+1)^2=7+2√7+1=8+2√7
b)(√5-3)^2=5-6√5+9=14-6√5
c)(6-√3)^2=36-12√3+3=39-12√3
d)(√3+√2)^2=3+2√6+2=5+2√6
e)(√6+√15)^2=6+2√90+15=21+6√10
f)((√2:2)-√6)^2=1/2-√12+6=5 1/2+2√3
